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Linux/arch/ia64/sn/kernel/sn2/timer.c

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  1 /*
  2  * linux/arch/ia64/sn/kernel/sn2/timer.c
  3  *
  4  * Copyright (C) 2003 Silicon Graphics, Inc.
  5  * Copyright (C) 2003 Hewlett-Packard Co
  6  *      David Mosberger <davidm@hpl.hp.com>: updated for new timer-interpolation infrastructure
  7  */
  8 
  9 #include <linux/init.h>
 10 #include <linux/kernel.h>
 11 #include <linux/sched.h>
 12 #include <linux/time.h>
 13 #include <linux/interrupt.h>
 14 #include <linux/clocksource.h>
 15 
 16 #include <asm/hw_irq.h>
 17 #include <asm/timex.h>
 18 
 19 #include <asm/sn/leds.h>
 20 #include <asm/sn/shub_mmr.h>
 21 #include <asm/sn/clksupport.h>
 22 
 23 extern unsigned long sn_rtc_cycles_per_second;
 24 
 25 static cycle_t read_sn2(struct clocksource *cs)
 26 {
 27         return (cycle_t)readq(RTC_COUNTER_ADDR);
 28 }
 29 
 30 static struct clocksource clocksource_sn2 = {
 31         .name           = "sn2_rtc",
 32         .rating         = 450,
 33         .read           = read_sn2,
 34         .mask           = (1LL << 55) - 1,
 35         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 36 };
 37 
 38 /*
 39  * sn udelay uses the RTC instead of the ITC because the ITC is not
 40  * synchronized across all CPUs, and the thread may migrate to another CPU
 41  * if preemption is enabled.
 42  */
 43 static void
 44 ia64_sn_udelay (unsigned long usecs)
 45 {
 46         unsigned long start = rtc_time();
 47         unsigned long end = start +
 48                         usecs * sn_rtc_cycles_per_second / 1000000;
 49 
 50         while (time_before((unsigned long)rtc_time(), end))
 51                 cpu_relax();
 52 }
 53 
 54 void __init sn_timer_init(void)
 55 {
 56         clocksource_sn2.archdata.fsys_mmio = RTC_COUNTER_ADDR;
 57         clocksource_register_hz(&clocksource_sn2, sn_rtc_cycles_per_second);
 58 
 59         ia64_udelay = &ia64_sn_udelay;
 60 }
 61 

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